Jonathan Mason | |
|---|---|
Portrait of Mason,c. 1805 | |
| United States Senator fromMassachusetts | |
| In office November 14, 1800 – March 3, 1803 | |
| Preceded by | Benjamin Goodhue |
| Succeeded by | John Quincy Adams |
| Member of theU.S. House of Representatives from Massachusetts's1st district | |
| In office March 4, 1817 – May 15, 1820 | |
| Preceded by | Artemas Ward Jr. |
| Succeeded by | Benjamin Gorham |
| Member of theMassachusetts Senate | |
| In office 1799–1800 | |
| Member of theMassachusetts House of Representatives | |
| In office 1786–1796 | |
| Personal details | |
| Born | (1756-09-12)September 12, 1756 |
| Died | November 1, 1831(1831-11-01) (aged 75) Boston, Massachusetts, U.S. |
| Political party | Federalist |
| Alma mater | College of New Jersey |
| Profession | Law |
| Signature | |
Jonathan Mason (September 12, 1756 – November 1, 1831) was aFederalistUnited States Senator andRepresentative fromMassachusetts during the early years of theUnited States.

Mason was born inBoston in theProvince of Massachusetts Bay on September 12, 1756. He was a son of Jonathan Mason (1725–1798) and Miriam (née Clarke) Mason (1724–1794).[1]
He attendedBoston Latin School the College of New Jersey (nowPrinceton University), graduating in 1774. After studying law, he was admitted to the bar in 1779.[2]
In 1780, Mason delivered the annual address marking the Boston Massacre.[3]
Starting in 1795, Mason was a partner in theMount Vernon Proprietors, a developer of real estate in Boston's Beacon Hill neighborhood. Around 1800 he built a mansion for himself on Mt. Vernon Street, in which he lived through the end of his life. Around 1804 he hired architect Charles Bulfinch to design 4 houses, also on Mt. Vernon Street, for each of his daughters; the 4 houses still stand today.[4]
Mason was also a member of the South Boston Association, which developed real estate in Dorchester.[5]
He was a Member of theMassachusetts House of Representatives from 1786 to 1796.[2]
From 1797 to 1798, he served with theMassachusetts Governor's Council and was elected for the following two years, and was in theMassachusetts Senate from 1799 to 1800. Following the resignation of SenatorBenjamin Goodhue, he was elected to theU.S. Senate, where he served from November 14, 1800, to March 3, 1803. He then resumed his law practice and served again in the Massachusetts Senate from 1803 to 1804 and the Massachusetts House from 1805 to 1808.[2]
He served again in the U.S. House of Representatives from March 4, 1817, to May 15, 1820, whereupon he resigned to pursue his law practice.[2]


On April 13, 1779, Mason married Susannah Powell (1760–1836). Together, they were the parents of five daughters and two sons:
Between 1804 and 1805,Gilbert Stuart painted his portrait and that of his wife Susannah and daughter Anna.[15]
Mason died in Boston, at age 75.[16] He is interred inMount Auburn Cemetery inCambridge, Massachusetts.[17][18]
Through his son William he was a grandfather ofElizabeth Rogers Mason Cabot, the wife of Walter Channing Cabot (son ofSamuel Cabot Jr.). Elizabeth was involved in running theHome for Aged Colored Women in Boston, as well as theChildren's Aid Society and theWoman's Education Association.[19]
| U.S. Senate | ||
|---|---|---|
| Preceded by | U.S. senator (Class 1) from Massachusetts 1800 – 1803 Served alongside:Dwight Foster | Succeeded by |
| U.S. House of Representatives | ||
| Preceded by | Member of the U.S. House of Representatives fromMassachusetts's 1st congressional district March 4, 1817 – May 15, 1820 | Succeeded by |